Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8e3cea143336ef…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 09:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0576d448d6ac52fd4adf662879a61e4e SHA-1: b312fd05a6b1ad6b4fe4a773daedde3e5e96f67f SHA-256: 1c8e3cea143336ef68f51e5efde8a37f8237f3c49e5e126f99775d0075a0dba1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, indicative of a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the PDF structure suggest it's designed to redirect users to external sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/wix?keyword=freddi+fish+android+apk PDF link annotation
    • http://policyhelpcenter.com/wenifixaxewodelivefotutag6b88.pdfIn PDF document text
    • http://megatorg.ru/12399532481ar8s4.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/53012575708.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/how_to_convert_file_to_word_macbook_air.pdfIn PDF document text
    • http://fishing-rods2.club/adobe_acrobat_reader_windows_80bm00.pdfIn PDF document text
    • http://fitnesspack.net/filosofa_del_derecho_penal_que_esyuq4e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ff4e58-9189-4e8a-b151-a797c637e89f/wigopigimaguruxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cdec4d9-63e0-49a2-a541-728a4afcc2ff/xiburiluw.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/how_many_books_in_miss_peregrine_series.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/why_is_my_karcher_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac4a9bd-dcf6-4a74-b2c8-93e2816d6ff0/on_the_road_2012_full_movie_online_watch.pdfIn PDF document text
    • http://kubowulurarekij.myartsonline.com/sisuzudosukavu.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_03e139dc033e4aedb831fda5114b16fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/how_to_put_together_a_metal_bunk_bed_with_futon.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/boxijowijijojaxipokef.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/96845350485.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/better_a_surgeon_s_notes_on_performance.pdfIn PDF document text
    • http://dezobod.onlinewebshop.net/is_so3gh2ol-_h2so4aq_a_redox_reaction.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_8e7138a23c7848e5a999cbadcdbfc9d3.pdf?index=trueIn PDF document text
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_6145fabafb5444efbd35b498a4cc83f9.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 5116 bytes
SHA-256: d805b096949004ef1ae703aa839f7b4f3d4768ba15ca6f230989328a467740c7
font_01_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 12488 bytes
SHA-256: 8371c4a23fad68ce76091c8f9b5caad537ddb3383c4fc1c8843a2d905319d09e

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